1 files changed, 8 insertions, 1 deletions
diff --git a/test/unit/test_c_api.cpp b/test/unit/test_c_api.cpp
index 34f32c19..2a82af64 100644
--- a/test/unit/test_c_api.cpp
+++ b/test/unit/test_c_api.cpp
@@ -2373,10 +2373,17 @@ TEST_F(CApi, check_coord_op_obj_can_be_used_with_proj_trans) {
 // ---------------------------------------------------------------------------
 
 TEST_F(CApi, proj_create_projections) {
+    {
+        constexpr int invalid_zone_number = 0;
+        auto projCRS =
+            proj_create_conversion_utm(m_ctxt, invalid_zone_number, 0);
+        ObjectKeeper keeper_projCRS(projCRS);
+        ASSERT_EQ(projCRS, nullptr);
+    }
 
     /* BEGIN: Generated by scripts/create_c_api_projections.py*/
     {
-        auto projCRS = proj_create_conversion_utm(m_ctxt, 0, 0);
+        auto projCRS = proj_create_conversion_utm(m_ctxt, 1, 0);
         ObjectKeeper keeper_projCRS(projCRS);
         ASSERT_NE(projCRS, nullptr);
     }